checkbox: change event emits [Event] instead of boolean

[devversion]

Sometimes, when triggering the change event on the input, by clicking on it, the change output will emit the actual event object, instead of the correct boolean.

• https://developer.mozilla.org/de/docs/Web/Events/change

Already working on a PR, which includes some tests and fixes it.

Sample test (without fix)

After searching in the Angular Repository I found the right issue

• component events should mask event propagation. angular#4059

[jelbourn]

@devversion we actually want the checkbox to fire something like an MdCheckboxChange event if you wanted to PR that instead.

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